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Music is one of the most universal forms of communication and entertainment across cultures. This can largely be credited to the sense of synesthesia, or the combining of senses. Based on this concept of synesthesia, we want to explore whether generative AI can create visual representations for music. The aim is to inspire the user’s imagination and enhance the user experience when enjoying music. Our approach has the following steps: (a) Music is analyzed and classified into multiple dimensions (including instruments, emotion, tempo, pitch range, harmony, and dynamics) to produce textual descriptions. (b) The texts form inputs of machine models that can predict the genre of the input audio. (c) The prompts are inputs of generative machine models to create visual representations. The visual representations are continuously updated as the music plays, ensuring that the visual effects aptly mirror the musical changes. A comprehensive user study with 88 users confirms that our approach is able to generate visual art reflecting the music pieces. From a list of images covering both abstract images and realistic images, users considered that our system-generated images can better represent pieces of music than human-chosen images. It suggests that generative arts can become a promising method to enhance users' listening experience while enjoying music. Our method provides a new approach to visualize music and to enjoy music through generative arts.